OpenWrt support for Zyxel GS2200

Hi! Has anyone tried openWrt with Zyxel GS2200 switches? They look pretty similar to the GS1900 ones, but I still haven't found out if they use the same hardware.

Try to dissect a fw file, if there are any available.
Could also try to read the serial console, or open it up, if the serial isn't accessible from outside.